﻿#region Copyright and Licensing Notice
// Copyright (C) 2011 Steven Bosnick
// 
// This program is open source software; you can redistribute it 
// and/or modifiy it under the terms of the Eclipse Public License,
// version 1.0.
// 
// This program is distributed in the hope that it will be useful, 
// but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A 
// PARTICULAR PURPOSE. See the Eclipse Public License for more
// details.
// 
// You should have received a copy of the Eclipse Public License 
// along with this program; if not, you can find a copy at
// "http://www.opensource.org/licenses/eclipse-1.0.php".
#endregion
using System;
using System.Threading.Tasks;
using BitwiseOre.SharedMemory.Core.Common;

namespace BitwiseOre.SharedMemory.Core
{
    internal sealed class Disconnector : IDisconnector
    {
        private readonly IConnectionQueues _connectionQueues;
        private readonly Func<TimeSpan, ITimeoutHelper> _createTimeoutHelper;

        public Disconnector(IConnectionQueues connectionQueues, Func<TimeSpan, ITimeoutHelper> createTimeoutHelper)
        {
            _connectionQueues = connectionQueues;
            _createTimeoutHelper = createTimeoutHelper;
        }

        public Task Disconnect(TimeSpan timeOut)
        {
            var helper = _createTimeoutHelper(timeOut);

            return new Task(() => _connectionQueues.ShutdownWrite(helper.RemainingTime)
                                      .Then(() => _connectionQueues.PurgeReadBuffers(helper)));
        }
    }
}